/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
package org.apache.tools.ant.types.resources;
import java.io.File;
import java.util.Collection;
import java.util.Iterator;
import java.util.Stack;
import java.util.stream.Collectors;
import java.util.stream.Stream;
import org.apache.tools.ant.BuildException;
import org.apache.tools.ant.Project;
import org.apache.tools.ant.types.DataType;
import org.apache.tools.ant.types.Mapper;
import org.apache.tools.ant.types.Reference;
import org.apache.tools.ant.types.Resource;
import org.apache.tools.ant.types.ResourceCollection;
import org.apache.tools.ant.util.FileNameMapper;
import org.apache.tools.ant.util.IdentityMapper;
import org.apache.tools.ant.util.MergingMapper;
/**
* Wrapper around a resource collections that maps the names of the
* other collection using a configured mapper.
* @since Ant 1.8.0
*/
public class MappedResourceCollection
extends DataType implements ResourceCollection, Cloneable {
private ResourceCollection nested = null;
private Mapper mapper = null;
private boolean enableMultipleMappings = false;
private boolean cache = false;
private Collection<Resource> cachedColl = null;
/**
* Adds the required nested ResourceCollection.
* @param c the ResourceCollection to add.
* @throws BuildException on error.
*/
public synchronized void add(ResourceCollection c) throws BuildException {
if (isReference()) {
throw noChildrenAllowed();
}
if (nested != null) {
throw new BuildException("Only one resource collection can be"
+ " nested into mappedresources",
getLocation());
}
setChecked(false);
cachedColl = null;
nested = c;
}
/**
* Define the mapper to map source to destination files.
* @return a mapper to be configured.
* @exception BuildException if more than one mapper is defined.
*/
public Mapper createMapper() throws BuildException {
if (isReference()) {
throw noChildrenAllowed();
}
if (mapper != null) {
throw new BuildException("Cannot define more than one mapper",
getLocation());
}
setChecked(false);
mapper = new Mapper(getProject());
cachedColl = null;
return mapper;
}
/**
* Add a nested filenamemapper.
* @param fileNameMapper the mapper to add.
* @since Ant 1.6.3
*/
public void add(FileNameMapper fileNameMapper) {
createMapper().add(fileNameMapper);
}
/**
* Set method of handling mappers that return multiple
* mappings for a given source path.
* @param enableMultipleMappings If true the type will
* use all the mappings for a given source path, if
* false, only the first mapped name is
* processed.
* By default, this setting is false to provide backward
* compatibility with earlier releases.
* @since Ant 1.8.1
*/
public void setEnableMultipleMappings(boolean enableMultipleMappings) {
this.enableMultipleMappings = enableMultipleMappings;
}
/**
* Set whether to cache collections.
* @since Ant 1.8.1
*/
public void setCache(boolean cache) {
this.cache = cache;
}
/**
* {@inheritDoc}
*/
@Override
public boolean isFilesystemOnly() {
if (isReference()) {
return getCheckedRef().isFilesystemOnly();
}
checkInitialized();
return false;
}
/**
* {@inheritDoc}
*/
@Override
public int size() {
if (isReference()) {
return getCheckedRef().size();
}
checkInitialized();
return cacheCollection().size();
}
/**
* {@inheritDoc}
*/
@Override
public Iterator<Resource> iterator() {
if (isReference()) {
return getCheckedRef().iterator();
}
checkInitialized();
return cacheCollection().iterator();
}
/**
* Overrides the base version.
* @param r the Reference to set.
*/
@Override
public void setRefid(Reference r) {
if (nested != null || mapper != null) {
throw tooManyAttributes();
}
super.setRefid(r);
}
/**
* Implement clone. The nested resource collection and mapper are copied.
* @return a cloned instance.
*/
@Override
public MappedResourceCollection clone() {
try {
MappedResourceCollection c =
(MappedResourceCollection) super.clone();
c.nested = nested;
c.mapper = mapper;
c.cachedColl = null;
return c;
} catch (CloneNotSupportedException e) {
throw new BuildException(e);
}
}
/**
* Overrides the version of DataType to recurse on all DataType
* child elements that may have been added.
* @param stk the stack of data types to use (recursively).
* @param p the project to use to dereference the references.
* @throws BuildException on error.
*/
@Override
protected synchronized void dieOnCircularReference(Stack<Object> stk, Project p)
throws BuildException {
if (isChecked()) {
return;
}
if (isReference()) {
super.dieOnCircularReference(stk, p);
} else {
checkInitialized();
if (mapper != null) {
pushAndInvokeCircularReferenceCheck(mapper, stk, p);
}
if (nested instanceof DataType) {
pushAndInvokeCircularReferenceCheck((DataType) nested, stk, p);
}
setChecked(true);
}
}
private void checkInitialized() {
if (nested == null) {
throw new BuildException(
"A nested resource collection element is required",
getLocation());
}
dieOnCircularReference();
}
private synchronized Collection<Resource> cacheCollection() {
if (cachedColl == null || !cache) {
cachedColl = getCollection();
}
return cachedColl;
}
private Collection<Resource> getCollection() {
FileNameMapper m =
mapper == null ? new IdentityMapper() : mapper.getImplementation();
Stream<MappedResource> stream;
if (enableMultipleMappings) {
stream = nested.stream()
.flatMap(r -> Stream.of(m.mapFileName(r.getName()))
.map(MergingMapper::new)
.map(mm -> new MappedResource(r, mm)));
} else {
stream = nested.stream().map(r -> new MappedResource(r, m));
}
return stream.collect(Collectors.toList());
}
/**
* Format this resource collection as a String.
* @return a descriptive <code>String</code>.
*/
@Override
public String toString() {
if (isReference()) {
return getCheckedRef().toString();
}
return isEmpty() ? "" : stream().map(Object::toString)
.collect(Collectors.joining(File.pathSeparator));
}
@Override
protected MappedResourceCollection getCheckedRef() {
return (MappedResourceCollection) super.getCheckedRef();
}
}